What was the unexpected inspiration behind Nike's famous 'Just Do It' slogan created in 1988?

Brand slogans can define pop culture moments and become part of our collective consciousness. Some taglines are so powerful they transcend their products and become cultural touchstones. Nike's 'Just Do It' is one of the most recognized slogans worldwide, but do you know the surprising story behind its creation? Test your knowledge of this iconic pop culture marketing moment!

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The last words of Utah murderer Gary Gilmore before his execution: 'Let's do it'
A line from the 1987 Schwarzenegger film 'Predator' where his character says 'Do it! Do it now!'
A Nike focus group participant who said 'Why think about it? Just do it' when asked about exercise motivation
Co-founder Phil Knight's college track coach who would tell his runners 'Don't think, just do it' before races